:root {
  color-scheme: light;
  --ink: #321813;
  --ink-soft: rgba(50, 24, 19, 0.64);
  --paper: #ead8ad;
  --paper-deep: #c9a86c;
  --shadow: rgba(32, 18, 9, 0.26);
  --button: #321813;
  --button-text: #f3e4bd;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 18% 12%, rgba(255, 244, 206, 0.72), transparent 28%),
    linear-gradient(135deg, #1c120d 0%, #3a2117 42%, #71472a 100%);
  font-family: Georgia, "Times New Roman", serif;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
}

button,
textarea {
  font: inherit;
}

.app {
  min-height: 100svh;
  padding: max(18px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right)) max(18px, env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
  display: grid;
  place-items: center;
}

.diary {
  width: min(1180px, 100%);
  min-height: min(820px, calc(100svh - 36px));
  background:
    linear-gradient(90deg, transparent 49.5%, rgba(83, 49, 31, 0.24) 50%, transparent 50.5%),
    linear-gradient(90deg, #d6b978, var(--paper) 10%, #f1dfb7 48%, #d4b16f 50%, #f1dfb7 52%, var(--paper) 90%, #bf9656);
  border: 1px solid rgba(255, 238, 190, 0.25);
  border-radius: 8px;
  box-shadow: 0 22px 80px var(--shadow);
  overflow: hidden;
  position: relative;
}

.diary::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(0deg, rgba(70, 32, 17, 0.06) 0 1px, transparent 1px 34px),
    radial-gradient(circle at 40% 30%, rgba(98, 60, 22, 0.1), transparent 34%);
  mix-blend-mode: multiply;
  pointer-events: none;
}

.topbar {
  position: relative;
  z-index: 1;
  min-height: 86px;
  padding: 22px clamp(18px, 4vw, 42px) 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

h1 {
  margin: 0;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1;
  letter-spacing: 0;
}

.topbar p {
  margin: 8px 0 0;
  color: var(--ink-soft);
  font-size: 16px;
}

.actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

button {
  height: 44px;
  min-width: 44px;
  border: 1px solid rgba(58, 28, 20, 0.28);
  border-radius: 8px;
  background: rgba(248, 231, 188, 0.6);
  color: var(--ink);
  cursor: pointer;
  transition: transform 160ms ease, background 160ms ease;
}

button:active {
  transform: translateY(1px);
}

#sendBtn {
  padding: 0 22px;
  background: var(--button);
  color: var(--button-text);
}

#clearBtn {
  font-size: 32px;
  line-height: 1;
}

.pages {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: calc(min(820px, 100svh - 36px) - 86px);
}

.page {
  --page-pad: clamp(18px, 3vw, 44px);
  position: relative;
  padding: var(--page-pad);
}

.input-page {
  border-right: 1px solid rgba(70, 38, 24, 0.18);
}

#inkCanvas {
  position: absolute;
  inset: var(--page-pad);
  touch-action: none;
  pointer-events: auto;
}

#promptInput {
  position: absolute;
  left: var(--page-pad);
  right: var(--page-pad);
  bottom: var(--page-pad);
  min-height: 132px;
  padding: 14px 16px;
  border: 1px solid rgba(68, 35, 23, 0.22);
  border-radius: 8px;
  resize: none;
  color: var(--ink);
  background: rgba(255, 246, 220, 0.66);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.42);
  outline: none;
}

#promptInput:focus {
  border-color: rgba(82, 35, 26, 0.56);
}

.reply {
  white-space: pre-wrap;
  font-size: clamp(25px, 3.4vw, 43px);
  line-height: 1.48;
  color: #4b1715;
  text-shadow: 0 0 0.1px #4b1715;
}

.reply::after {
  content: "";
  display: inline-block;
  width: 0.42em;
  height: 1em;
  margin-left: 2px;
  border-bottom: 2px solid currentColor;
  opacity: 0;
}

.reply.writing::after {
  opacity: 1;
  animation: blink 900ms steps(2, end) infinite;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

@media (max-width: 760px) {
  .app {
    padding: 0;
    align-items: stretch;
  }

  .diary {
    min-height: 100svh;
    border: 0;
    border-radius: 0;
  }

  .topbar {
    min-height: 76px;
  }

  .pages {
    grid-template-columns: 1fr;
    min-height: calc(100svh - 76px);
  }

  .input-page {
    min-height: 46svh;
    border-right: 0;
    border-bottom: 1px solid rgba(70, 38, 24, 0.18);
  }

  .reply-page {
    min-height: 42svh;
  }

  .reply {
    font-size: clamp(24px, 8vw, 36px);
  }
}